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Bench Mark Sheet for 8669801, BLOODY POINT, NEW RIVER SC

Superseded Epoch

Large map location marker Station Location
Small red map location marker Published bench mark
Small blue map location marker Unpublished bench mark

Bench mark positions only appear on the map if their coordinates in the CO-OPS database are at the precision of degrees/minutes/seconds/and tenths of seconds. If the coordinates are less precise, the mark will not appear.

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  5

                                                                                
Station ID: 8669801                         PUBLICATION DATE:  03/09/2004
Name:       BLOODY POINT, NEW RIVER                           
            SC
NOAA Chart: 11512                           Latitude:   32°  4.9' N (  32.08170)
USGS Quad:  FORT PULASKI                    Longitude:  80° 52.7' W ( -80.87830)


To reach the tidal bench marks by boat from the public boat landing at South
Beach, Hilton Head Island, proceed north and west across Calibogue Sound to
Cooper River (the Intracoastal Waterway), then proceed SW on Copper River for
6.0 km (3.7 mi) to Ramshorn Creek, then proceed south on Ramshorn Creek for 1.9
km (1.2 mi) to New River, then proceed south on New River for 7.9 km (4.9 mi) to
the entrance.  The bench marks are located on the west side of Bloody Point. 
The tide gage and staff were located on an offshore platform off Bloody Point,
Daufuskie Island.


                         T I D A L   B E N C H   M A R K S


                 PRIMARY BENCH MARK STAMPING:  9801 E 1980
                         DESIGNATION:          866 9801 E TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4693
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CK2117
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   32°  4.9' N (  32.08170)          LONGITUDE:  80° 52.6' W ( -80.87670)


The primary bench mark is a disk located 4.02 m (13.2 ft) NNE of a 0.46 m (1.5
ft) diameter pine tree, 2 m (7 ft) SSE of a 0.46 m (1.5 ft) diameter pine tree,
1.62 m (5.3 ft) NNE of a 0.46 m (1.5 ft) diameter pine tree, and 0.61 m (2.0 ft)
west of a witness post.  The bench mark is crimped to the top of a stainless
steel rod driven 10.7 m (35 ft) to refusal, and encased in a 4-inch PVC pipe and
concrete kickblock.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  5

                                                                                
Station ID: 8669801                         PUBLICATION DATE:  03/09/2004
Name:       BLOODY POINT, NEW RIVER                           
            SC
NOAA Chart: 11512                           Latitude:   32°  4.9' N (  32.08170)
USGS Quad:  FORT PULASKI                    Longitude:  80° 52.7' W ( -80.87830)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  9801 C 1980
                         DESIGNATION:          866 9801 C TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4692
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CK2116
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   32°  4.9' N (  32.08170)          LONGITUDE:  80° 52.6' W ( -80.87670)


The bench mark is a disk located 24.93 m (81.8 ft) SSW of bench mark 9801 E
1980, 16.61 m (54.5 ft) NNE of a triple-trunk oak tree, 8.35 m (27.4 ft) WNW of
a 0.37 m (1.2 ft) diameter twin oak tree, and 5.43 m (17.8 ft) ENE of a 0.24 m
(0.8 ft) diameter pine tree.  The bench mark is set 9 cm (0.3 ft) below ground
level, crimped to the top of a stainless steel rod driven 12.2 m (40 ft) to
refusal, and encased in a 4-inch PVC pipe and concrete kickblock.



                         BENCH MARK STAMPING:  9801 F 1981
                         DESIGNATION:          866 9801 F TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4694
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CK2118
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   32°  5.0' N (  32.08330)          LONGITUDE:  80° 52.6' W ( -80.87670)


The bench mark is a disk set in a concrete monument, 36.48 m (119.7 ft) SSW of
bench mark 9801 G 1981, 5.64 m (18.5 ft) SSW of a 0.46 m (1.5 ft) diameter oak
tree, 4.18 m (13.7 ft) ENE of a twin oak tree, and 1.40 m (4.6 ft) west of a
witness post.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  5

                                                                                
Station ID: 8669801                         PUBLICATION DATE:  03/09/2004
Name:       BLOODY POINT, NEW RIVER                           
            SC
NOAA Chart: 11512                           Latitude:   32°  4.9' N (  32.08170)
USGS Quad:  FORT PULASKI                    Longitude:  80° 52.7' W ( -80.87830)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  9801 G 1981
                         DESIGNATION:          866 9801 G TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4695
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CK2119
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   32°  5.0' N (  32.08330)          LONGITUDE:  80° 52.6' W ( -80.87670)


The bench mark is a disk set in a concrete monument, 66.66 m (218.7 ft) WSW of
bench mark 9801 H 1981, 7.47 m (24.5 ft) south of a 0.76 m (2.5 ft) diameter oak
tree, 4.45 m (14.6 ft) north of a 0.49 m (1.6 ft) diameter oak tree, 0.91 m (3.0
ft) SW of a witness post, and 0.06 m (0.2 ft) above ground level.



                         BENCH MARK STAMPING:  9801 H 1981
                         DESIGNATION:          866 9801 H TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4696
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   32°  4.9' N (  32.08170)          LONGITUDE:  80° 52.6' W ( -80.87670)


The bench mark is a disk set in a concrete monument, 12.59 m (41.3 ft) WNW of a
1.22 m (4.0 ft) diameter five-trunk oak tree, 3.02 m (9.9 ft) SSE of a 0.40 m
(1.3 ft) diameter pine tree, 0.85 m (2.8 ft) west of a witness post, and 0.06 m
(0.2 ft) above ground level.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  5

                                                                                
Station ID: 8669801                         PUBLICATION DATE:  03/09/2004
Name:       BLOODY POINT, NEW RIVER                           
            SC
NOAA Chart: 11512                           Latitude:   32°  4.9' N (  32.08170)
USGS Quad:  FORT PULASKI                    Longitude:  80° 52.7' W ( -80.87830)


                            T I D A L   D A T U M S 


Tidal datums at BLOODY POINT, NEW RIVER based on:

     LENGTH OF SERIES:      3 MONTHS
     TIME PERIOD:           May 1981 - July 1981
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8670870 FORT PULASKI, SAVANNAH RIVER


Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:

     MEAN HIGHER HIGH WATER                     MHHW   =  2.238
     MEAN HIGH WATER                            MHW    =  2.126
     North American Vertical Datum              NAVD88 =  1.240
     MEAN SEA LEVEL                             MSL    =  1.135
     MEAN TIDE LEVEL                            MTL    =  1.094
     MEAN LOW WATER                             MLW    =  0.062
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     9801 E 1980                                 3.115    0.989
     9801 C 1980                                 2.692    0.566
     9801 F 1981                                 4.389    2.263
     9801 G 1981                                 3.222    1.096
     9801 H 1981                                 3.451    1.325


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  5

                                                                                
Station ID: 8669801                         PUBLICATION DATE:  03/09/2004
Name:       BLOODY POINT, NEW RIVER                           
            SC
NOAA Chart: 11512                           Latitude:   32°  4.9' N (  32.08170)
USGS Quad:  FORT PULASKI                    Longitude:  80° 52.7' W ( -80.87830)


                             D E F I N I T I O N S


Mean Sea Level (MSL) is a tidal datum determined over a 19-year National Tidal
Datum Epoch.  It pertains to local mean sea level and should not be confused
with the fixed datums of North American Vertical Datum of 1988 (NAVD88).

NAVD88 is a fixed datum derived from a simultaneous, least squares, minimum
constraint adjustment of Canadian/Mexican/United States leveling observations.
Local mean sea level observed at Father Point/Rimouski, Canada was held fixed as
the single initial constraint.  NAVD88 replaces NGVD29 as the national
standard geodetic reference for heights.  Bench mark elevations relative to
NAVD88 are available from NGS through the World Wide Web at 
National Geodetic Survey.

NGVD29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded.  NGVD29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads.  NGVD29 was originally derived from a general
adjustment of the first-order leveling networks of the U.S. and Canada after
holding mean sea level observed at 26 long term tide stations as fixed.
Numerous local and wide-spread adjustments have been made since establishment in
1929.  Bench mark elevations relative to NGVD29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at 
National Geodetic Survey.

NAVD88 and NGVD29 are fixed geodetic datums whose elevation relationships to
local MSL and other tidal datums may not be consistent from one location to
another.

The Vertical Mark Number (VM#) and PID# shown on the bench mark sheet are unique
identifiers for bench marks in the tidal and geodetic databases, respectively.
Each bench mark in either database has a single, unique VM# and/or PID# assigned.
Where both VM# and PID# are indicated, both tidal and geodetic elevations are
available for the bench mark listed. The NGS's Integrated Data Base (IDB PID)
provides geodetic datum based on traditionally leveled and bluebooked ties to
the National Spatial Reference System(NSRS) https://www.ngs.noaa.gov/datasheets/.
The NGS Online Positioning User Service (OPUS PID) provides geodetic datum based
on GPS position & tie it to the NSRS https://www.ngs.noaa.gov/OPUS/.

The NAVD88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD88 elevations.
The NAVD88 elevation relationship shown in the table is derived from an average
of several bench mark elevations relative to tide station datum.  As a result of
this averaging, NAVD88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD88 elevations listed for
each bench mark in the NGS database.

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Products available at 8669801 BLOODY POINT, NEW RIVER, SC

Revised: 08/08/2018
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services